LeetCode-Remove Duplicates from Sorted Array

题目：https://oj.leetcode.com/problems/remove-duplicates-from-sorted-array/

Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length.

Do not allocate extra space for another array, you must do this in place with constant memory.

For example,

Given input array A =

[1,1,2]

,

Your function should return length =

2

, and A is now

[1,2]

.

源码：Java版本

算法分析：时间复杂度O(n)，空间复杂度O(1)

public class Solution {
    public int removeDuplicates(int[] A) {
        if(A.length==0) {
            return 0;
        }
        
        int index=0;
        for(int i=1;i<A.length;i++) {
           if(A[i]!=A[index]) {
               A[++index]=A[i];
           }
        }
        return index+1;
    }
}